2012-08-23 19:14, Gary Aitken skrev:
On 08/23/12 08:38, Polytropon wrote:
On Thu, 23 Aug 2012 00:00:08 -0600, Gary Aitken wrote:
For the photo folks --
What do you use for inspecting EXIF data?
I've tried
exif
exiftags
exifprobe
and none of them show the full compliment of tags present on my oly pen-ep3.
In particular, they omit most of the vendor specific stuff,
and they seem to display different parts of things, but not everything.
I've been using exiv2 (port graphics/exiv2) which fits my needs.
Here's an example of its output:
% exiv2 cam/img_6842.jpg
File name : cam/img_6842.jpg
File size : 2887326 Bytes
MIME type : image/jpeg
Image size : 2816 x 2112
Camera make : Canon
Camera model : Canon PowerShot S3 IS
Image timestamp : 2011:08:19 09:14:42
Image number : 120-6842
Exposure time : 1/50 s
Aperture : F2.7
Exposure bias : 0 EV
Flash : No, red-eye reduction
Flash bias : 0 EV
Focal length : 6.0 mm
Subject distance: 68
ISO speed : 100
Exposure mode : Easy shooting (Auto)
Metering mode : Multi-segment
Macro mode : Off
Image quality : Fine
Exif Resolution : 2816 x 2112
White balance : Auto
Thumbnail : image/jpeg, 5981 Bytes
Copyright :
Exif comment :
See "man exiv2" for details. It's a really versatile program
which can be excellently integrated into scripts.
In case you need more info from a photo file, use the "strings"
utility provided by the system and parse its output.
Thanks
This is rather weird.
I had tried exiv2 and concluded it did not report everything because on a
windows system I had previously used PhotoME to ascertain that the image
stabilization parameter for my camera was in a field whose tag name was
"ImageQuality3", and exiv2 does not report anything with "uality" in it.
However, I now see that it does report a string called
"Exif.OlympusCs.ImageStabilization" of the same type with the corresponding
value.
Strings reports neither tag.
That makes sense, since exif tags are numerically encoded and not text,
so I don't think strings is particularly useful.
Upon further investigation, it appears that the choice of string to print
for a tag is probably a translation provided by the program, not the image file.
A strings on /usr/local/lib/libexiv2.so.10 shows:
Image stabilization
ImageStabilization
Image Stabilization for the Sony DSLR-A100
Image stabilization data
Image Stabilization Data
ImageStabilizationData
Image Stabilization A100
ImageStabilizationA100
Digital Image Stabilization
and also specific tags for different camera manufacturers, e.g.
Exif.OlympusCs.
etc.
bah --
exif doesn't report all the tags
Try exif -l filename and it will show you all exif fields and the fields
that's in the picture.
From man exif
-l, --list-tags
List all known EXIF tags and IFDs. A JPEG image must be pro-
vided, and those tags which appear in the file are shown with an
asterisk in the corresponding position in the list.
warren --
thanks, I thought I tried p5-Image-ExifTool but in looking back at my notes
I have a thing that says "install ExifTool" and its not there so obviously I
didn't to that. Will check it if exiv2 doesn't work out.
Gary
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